"We believe the suspect may potentially be in a customer service position or door-to-door-sales or polls," said Ure.

Additionally, Ure said it appears the suspect had been casing out the bank prior to committing the crime.

"He was in the bank for at least 10 minutes before he slipped the note to the teller," said Ure. "We believe he was in the bank earlier that day and possibly some other days."

Ure said it is possible the suspect may have been studying other banks in the area last week.

About 3:20 p.m., security cameras captured the suspect, who is described as a dark-skinned black man wearing "metallic-looking" sunglasses and a blue baseball cap, entering through the bank's west door.

While on a flip cell phone, the robber slipped a teller a note demanding money.

The note also claimed the suspect was armed, though no weapon was ever displayed, Ure said.

The suspect is described as having white blotches on his left hand, which could be a birthmark or from an old burn, said Ure.

The FBI is also working on the case.

Anyone with information about the case is asked to call the police department at 361-485-3700.